在socket.io中获得套接字的空间

Question

How do I retrieve the rooms a socket is a member of? I'm using socket.io version 1.4

I tried with this.socket.adapter.rooms but I received this error in the chrome console: Cannot read property 'rooms' of undefined

In my client code I have this method:

send(msg) {
        if(msg != ''){
            var clientInfo = [];
            clientInfo.push(msg);
            clientInfo.push(socket.id);
            clientInfo.push(this.socket.adapter.rooms);
            socket.emit('message', clientInfo);
        }
    }

On my server side:

socket.on('message', function(clientInfo){
        var clientmessage = clientInfo[0];
        var clientid = clientInfo[1];
        var clientroom = clientInfo[2];
        io.to(clientroom).emit('messageSent', clientmessage);
    });

Answer 1

Server side, you can get a list of rooms a socket is in with:

socket.rooms

Client side, a socket does not know what rooms it is in. The whole concept of rooms is a server-side concept and all the data structures are maintained there. If a client wanted to know what rooms it was in, it would either have to keep track of what rooms it requested to be a member of or it would have to ask the server what rooms it is in.

There is one oddity about the server-side socket.rooms structure. It is apparently not updated real-time. If you do socket.join("someRoom") and then immediately look at socket.rooms , you will not see the someRoom name listed. But, if you look on process.nextTick() or on setTimeout() , you will see it in socket.rooms . I haven't delved into the socket.io source code to figure out why that is the way it is, but apparently something is only being updated asynchronously.

Answer 2

            Object.keys(socket.rooms).forEach(function(room, idx) {
                if(idx!=0){
                    console.log(idx,"-->",room)
                }
             });

By the above code you can identify all the rooms the socket have joined. You can skip the first room which is in index 0 as it is the default room a socket will connect on connection.

Tested this with SocketIO 1.7 and works well.